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Clinohedrite is a rare silicate mineral. Its chemical composition is a hydrous calclium-zinc silicate; CaZnSiO4·H2O. It crystallizes in the monoclinic system and typically occurs as veinlets and fracture coatings. It is commonly colorless, white to pale amethyst in color. It has perfect cleavage and a brilliant luster. It has a Mohs hardness of 5.5 and a specific gravity of 3.28 - 3.33.[1][2]

Under SW ultraviolet light it fluoresces a rich orange color. It is frequently associated with minerals such as hardystonite (fluoresces purple), esperite (fluoresces bright yellow), calcite (fluoresces orange-red), franklinite (non-fluorescent) and willemite (fluoresces green).[3]

Clinohedrite is found primarily at the Franklin and Sterling Hill mines in Franklin, New Jersey, but has also been reported from the Christmas mine, Gila County, Arizona.[1]

It was first described in 1898 and was named for its crystal morphology from the Greek klino for incline, and hedra for face.[1]

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